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    <p>As per the comment discussion, to meet the requirements of your question, your best bet would probably be the <code>NativeWindow</code> solution. </p> <p>However, I would still recommend that you speak with your colleagues to see if there's another alternative that might make things easier on your part. <strong>If you create solutions for your customers based on solutions provided by your colleagues, there is a strong potential that you will have to rewrite your customized solutions as often as your colleagues deploy their latest updates...</strong></p> <p><a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.nativewindow.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.windows.forms.nativewindow.aspx</a></p> <pre><code>using System; using System.Drawing; using System.Windows.Forms; using System.Runtime.InteropServices; namespace NativeWindowApplication { // Summary description for Form1. [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] public class Form1 : System.Windows.Forms.Form { private MyNativeWindowListener nwl; private MyNativeWindow nw; internal void ApplicationActivated(bool ApplicationActivated) { // The application has been activated or deactivated System.Diagnostics.Debug.WriteLine("Application Active = " + ApplicationActivated.ToString()); } private Form1() { this.Size = new System.Drawing.Size(300, 300); this.Text = "Form1"; nwl = new MyNativeWindowListener(this); nw = new MyNativeWindow(this); } // The main entry point for the application. [STAThread] static void Main() { Application.Run(new Form1()); } } // NativeWindow class to listen to operating system messages. [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] internal class MyNativeWindowListener : NativeWindow { // Constant value was found in the "windows.h" header file. private const int WM_ACTIVATEAPP = 0x001C; private Form1 parent; public MyNativeWindowListener(Form1 parent) { parent.HandleCreated += new EventHandler(this.OnHandleCreated); parent.HandleDestroyed += new EventHandler(this.OnHandleDestroyed); this.parent = parent; } // Listen for the control's window creation and then hook into it. internal void OnHandleCreated(object sender, EventArgs e) { // Window is now created, assign handle to NativeWindow. AssignHandle(((Form1)sender).Handle); } internal void OnHandleDestroyed(object sender, EventArgs e) { // Window was destroyed, release hook. ReleaseHandle(); } [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] protected override void WndProc(ref Message m) { // Listen for operating system messages switch (m.Msg) { case WM_ACTIVATEAPP: // Notify the form that this message was received. // Application is activated or deactivated, // based upon the WParam parameter. parent.ApplicationActivated(((int)m.WParam != 0)); break; } base.WndProc(ref m); } } // MyNativeWindow class to create a window given a class name. [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] internal class MyNativeWindow : NativeWindow { // Constant values were found in the "windows.h" header file. private const int WS_CHILD = 0x40000000, WS_VISIBLE = 0x10000000, WM_ACTIVATEAPP = 0x001C; private int windowHandle; public MyNativeWindow(Form parent) { CreateParams cp = new CreateParams(); // Fill in the CreateParams details. cp.Caption = "Click here"; cp.ClassName = "Button"; // Set the position on the form cp.X = 100; cp.Y = 100; cp.Height = 100; cp.Width = 100; // Specify the form as the parent. cp.Parent = parent.Handle; // Create as a child of the specified parent cp.Style = WS_CHILD | WS_VISIBLE; // Create the actual window this.CreateHandle(cp); } // Listen to when the handle changes to keep the variable in sync [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] protected override void OnHandleChange() { windowHandle = (int)this.Handle; } [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] protected override void WndProc(ref Message m) { // Listen for messages that are sent to the button window. Some messages are sent // to the parent window instead of the button's window. switch (m.Msg) { case WM_ACTIVATEAPP: // Do something here in response to messages break; } base.WndProc(ref m); } } } </code></pre>
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